<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.io;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import com.google.common.annotations.Beta;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import com.google.common.base.Preconditions;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.google.common.primitives.Ints;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.primitives.Longs;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.io.DataInput;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.io.DataInputStream;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.io.EOFException;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.io.FilterInputStream;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.io.IOException;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.io.InputStream;<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>/**<a name="line.31"></a>
<span class="sourceLineNo">032</span> * An implementation of {@link DataInput} that uses little-endian byte ordering<a name="line.32"></a>
<span class="sourceLineNo">033</span> * for reading {@code short}, {@code int}, {@code float}, {@code double}, and<a name="line.33"></a>
<span class="sourceLineNo">034</span> * {@code long} values.<a name="line.34"></a>
<span class="sourceLineNo">035</span> * &lt;p&gt;<a name="line.35"></a>
<span class="sourceLineNo">036</span> * &lt;b&gt;Note:&lt;/b&gt; This class intentionally violates the specification of its<a name="line.36"></a>
<span class="sourceLineNo">037</span> * supertype {@code DataInput}, which explicitly requires big-endian byte order.<a name="line.37"></a>
<span class="sourceLineNo">038</span> *<a name="line.38"></a>
<span class="sourceLineNo">039</span> * @author Chris Nokleberg<a name="line.39"></a>
<span class="sourceLineNo">040</span> * @author Keith Bottner<a name="line.40"></a>
<span class="sourceLineNo">041</span> * @since 8.0<a name="line.41"></a>
<span class="sourceLineNo">042</span> */<a name="line.42"></a>
<span class="sourceLineNo">043</span>@Beta<a name="line.43"></a>
<span class="sourceLineNo">044</span>public final class LittleEndianDataInputStream extends FilterInputStream<a name="line.44"></a>
<span class="sourceLineNo">045</span>    implements DataInput {<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>  /**<a name="line.47"></a>
<span class="sourceLineNo">048</span>   * Creates a {@code LittleEndianDataInputStream} that wraps the given stream.<a name="line.48"></a>
<span class="sourceLineNo">049</span>   *<a name="line.49"></a>
<span class="sourceLineNo">050</span>   * @param in the stream to delegate to<a name="line.50"></a>
<span class="sourceLineNo">051</span>   */<a name="line.51"></a>
<span class="sourceLineNo">052</span>  public LittleEndianDataInputStream(InputStream in) {<a name="line.52"></a>
<span class="sourceLineNo">053</span>    super(Preconditions.checkNotNull(in));<a name="line.53"></a>
<span class="sourceLineNo">054</span>  }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>  /**<a name="line.56"></a>
<span class="sourceLineNo">057</span>   * This method will throw an {@link UnsupportedOperationException}.<a name="line.57"></a>
<span class="sourceLineNo">058</span>   */<a name="line.58"></a>
<span class="sourceLineNo">059</span>  @Override<a name="line.59"></a>
<span class="sourceLineNo">060</span>  public String readLine() {<a name="line.60"></a>
<span class="sourceLineNo">061</span>    throw new UnsupportedOperationException("readLine is not supported");<a name="line.61"></a>
<span class="sourceLineNo">062</span>  }<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span>  @Override<a name="line.64"></a>
<span class="sourceLineNo">065</span>  public void readFully(byte[] b) throws IOException {<a name="line.65"></a>
<span class="sourceLineNo">066</span>    ByteStreams.readFully(this, b);<a name="line.66"></a>
<span class="sourceLineNo">067</span>  }<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>  @Override<a name="line.69"></a>
<span class="sourceLineNo">070</span>  public void readFully(byte[] b, int off, int len) throws IOException {<a name="line.70"></a>
<span class="sourceLineNo">071</span>    ByteStreams.readFully(this, b, off, len);<a name="line.71"></a>
<span class="sourceLineNo">072</span>  }<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>  @Override<a name="line.74"></a>
<span class="sourceLineNo">075</span>  public int skipBytes(int n) throws IOException {<a name="line.75"></a>
<span class="sourceLineNo">076</span>    return (int) in.skip(n);<a name="line.76"></a>
<span class="sourceLineNo">077</span>  }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>  @Override<a name="line.79"></a>
<span class="sourceLineNo">080</span>  public int readUnsignedByte() throws IOException {<a name="line.80"></a>
<span class="sourceLineNo">081</span>    int b1 = in.read();<a name="line.81"></a>
<span class="sourceLineNo">082</span>    if (0 &gt; b1) {<a name="line.82"></a>
<span class="sourceLineNo">083</span>      throw new EOFException();<a name="line.83"></a>
<span class="sourceLineNo">084</span>    }<a name="line.84"></a>
<span class="sourceLineNo">085</span>    <a name="line.85"></a>
<span class="sourceLineNo">086</span>    return b1;<a name="line.86"></a>
<span class="sourceLineNo">087</span>  }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span>  /**<a name="line.89"></a>
<span class="sourceLineNo">090</span>   * Reads an unsigned {@code short} as specified by<a name="line.90"></a>
<span class="sourceLineNo">091</span>   * {@link DataInputStream#readUnsignedShort()}, except using little-endian<a name="line.91"></a>
<span class="sourceLineNo">092</span>   * byte order.<a name="line.92"></a>
<span class="sourceLineNo">093</span>   *<a name="line.93"></a>
<span class="sourceLineNo">094</span>   * @return the next two bytes of the input stream, interpreted as an <a name="line.94"></a>
<span class="sourceLineNo">095</span>   *         unsigned 16-bit integer in little-endian byte order<a name="line.95"></a>
<span class="sourceLineNo">096</span>   * @throws IOException if an I/O error occurs<a name="line.96"></a>
<span class="sourceLineNo">097</span>   */<a name="line.97"></a>
<span class="sourceLineNo">098</span>  @Override<a name="line.98"></a>
<span class="sourceLineNo">099</span>  public int readUnsignedShort() throws IOException {<a name="line.99"></a>
<span class="sourceLineNo">100</span>    byte b1 = readAndCheckByte();<a name="line.100"></a>
<span class="sourceLineNo">101</span>    byte b2 = readAndCheckByte();<a name="line.101"></a>
<span class="sourceLineNo">102</span><a name="line.102"></a>
<span class="sourceLineNo">103</span>    return Ints.fromBytes((byte) 0, (byte) 0, b2, b1);<a name="line.103"></a>
<span class="sourceLineNo">104</span>  }<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span>  /**<a name="line.106"></a>
<span class="sourceLineNo">107</span>   * Reads an integer as specified by {@link DataInputStream#readInt()}, except<a name="line.107"></a>
<span class="sourceLineNo">108</span>   * using little-endian byte order.<a name="line.108"></a>
<span class="sourceLineNo">109</span>   *<a name="line.109"></a>
<span class="sourceLineNo">110</span>   * @return the next four bytes of the input stream, interpreted as an <a name="line.110"></a>
<span class="sourceLineNo">111</span>   *         {@code int} in little-endian byte order<a name="line.111"></a>
<span class="sourceLineNo">112</span>   * @throws IOException if an I/O error occurs<a name="line.112"></a>
<span class="sourceLineNo">113</span>   */<a name="line.113"></a>
<span class="sourceLineNo">114</span>  @Override<a name="line.114"></a>
<span class="sourceLineNo">115</span>  public int readInt() throws IOException {<a name="line.115"></a>
<span class="sourceLineNo">116</span>    byte b1 = readAndCheckByte();<a name="line.116"></a>
<span class="sourceLineNo">117</span>    byte b2 = readAndCheckByte();<a name="line.117"></a>
<span class="sourceLineNo">118</span>    byte b3 = readAndCheckByte();<a name="line.118"></a>
<span class="sourceLineNo">119</span>    byte b4 = readAndCheckByte();<a name="line.119"></a>
<span class="sourceLineNo">120</span><a name="line.120"></a>
<span class="sourceLineNo">121</span>    return Ints.fromBytes( b4, b3, b2, b1);<a name="line.121"></a>
<span class="sourceLineNo">122</span>  }<a name="line.122"></a>
<span class="sourceLineNo">123</span><a name="line.123"></a>
<span class="sourceLineNo">124</span>  /**<a name="line.124"></a>
<span class="sourceLineNo">125</span>   * Reads a {@code long} as specified by {@link DataInputStream#readLong()},<a name="line.125"></a>
<span class="sourceLineNo">126</span>   * except using little-endian byte order.<a name="line.126"></a>
<span class="sourceLineNo">127</span>   *<a name="line.127"></a>
<span class="sourceLineNo">128</span>   * @return the next eight bytes of the input stream, interpreted as a <a name="line.128"></a>
<span class="sourceLineNo">129</span>   *         {@code long} in little-endian byte order<a name="line.129"></a>
<span class="sourceLineNo">130</span>   * @throws IOException if an I/O error occurs<a name="line.130"></a>
<span class="sourceLineNo">131</span>   */<a name="line.131"></a>
<span class="sourceLineNo">132</span>  @Override<a name="line.132"></a>
<span class="sourceLineNo">133</span>  public long readLong() throws IOException {<a name="line.133"></a>
<span class="sourceLineNo">134</span>    byte b1 = readAndCheckByte();<a name="line.134"></a>
<span class="sourceLineNo">135</span>    byte b2 = readAndCheckByte();<a name="line.135"></a>
<span class="sourceLineNo">136</span>    byte b3 = readAndCheckByte();<a name="line.136"></a>
<span class="sourceLineNo">137</span>    byte b4 = readAndCheckByte();<a name="line.137"></a>
<span class="sourceLineNo">138</span>    byte b5 = readAndCheckByte();<a name="line.138"></a>
<span class="sourceLineNo">139</span>    byte b6 = readAndCheckByte();<a name="line.139"></a>
<span class="sourceLineNo">140</span>    byte b7 = readAndCheckByte();<a name="line.140"></a>
<span class="sourceLineNo">141</span>    byte b8 = readAndCheckByte();<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span>    return Longs.fromBytes(b8, b7, b6, b5, b4, b3, b2, b1);<a name="line.143"></a>
<span class="sourceLineNo">144</span>  }<a name="line.144"></a>
<span class="sourceLineNo">145</span><a name="line.145"></a>
<span class="sourceLineNo">146</span>  /**<a name="line.146"></a>
<span class="sourceLineNo">147</span>   * Reads a {@code float} as specified by {@link DataInputStream#readFloat()},<a name="line.147"></a>
<span class="sourceLineNo">148</span>   * except using little-endian byte order.<a name="line.148"></a>
<span class="sourceLineNo">149</span>   *<a name="line.149"></a>
<span class="sourceLineNo">150</span>   * @return the next four bytes of the input stream, interpreted as a<a name="line.150"></a>
<span class="sourceLineNo">151</span>   *         {@code float} in little-endian byte order<a name="line.151"></a>
<span class="sourceLineNo">152</span>   * @throws IOException if an I/O error occurs<a name="line.152"></a>
<span class="sourceLineNo">153</span>   */<a name="line.153"></a>
<span class="sourceLineNo">154</span>  @Override<a name="line.154"></a>
<span class="sourceLineNo">155</span>  public float readFloat() throws IOException {<a name="line.155"></a>
<span class="sourceLineNo">156</span>    return Float.intBitsToFloat(readInt());<a name="line.156"></a>
<span class="sourceLineNo">157</span>  }<a name="line.157"></a>
<span class="sourceLineNo">158</span><a name="line.158"></a>
<span class="sourceLineNo">159</span>  /**<a name="line.159"></a>
<span class="sourceLineNo">160</span>   * Reads a {@code double} as specified by<a name="line.160"></a>
<span class="sourceLineNo">161</span>   * {@link DataInputStream#readDouble()}, except using little-endian byte<a name="line.161"></a>
<span class="sourceLineNo">162</span>   * order.<a name="line.162"></a>
<span class="sourceLineNo">163</span>   *<a name="line.163"></a>
<span class="sourceLineNo">164</span>   * @return the next eight bytes of the input stream, interpreted as a<a name="line.164"></a>
<span class="sourceLineNo">165</span>   *         {@code double} in little-endian byte order<a name="line.165"></a>
<span class="sourceLineNo">166</span>   * @throws IOException if an I/O error occurs<a name="line.166"></a>
<span class="sourceLineNo">167</span>   */<a name="line.167"></a>
<span class="sourceLineNo">168</span>  @Override<a name="line.168"></a>
<span class="sourceLineNo">169</span>  public double readDouble() throws IOException {<a name="line.169"></a>
<span class="sourceLineNo">170</span>    return Double.longBitsToDouble(readLong());<a name="line.170"></a>
<span class="sourceLineNo">171</span>  }<a name="line.171"></a>
<span class="sourceLineNo">172</span><a name="line.172"></a>
<span class="sourceLineNo">173</span>  @Override<a name="line.173"></a>
<span class="sourceLineNo">174</span>  public String readUTF() throws IOException {<a name="line.174"></a>
<span class="sourceLineNo">175</span>    return new DataInputStream(in).readUTF();<a name="line.175"></a>
<span class="sourceLineNo">176</span>  }<a name="line.176"></a>
<span class="sourceLineNo">177</span><a name="line.177"></a>
<span class="sourceLineNo">178</span>  /**<a name="line.178"></a>
<span class="sourceLineNo">179</span>   * Reads a {@code short} as specified by {@link DataInputStream#readShort()},<a name="line.179"></a>
<span class="sourceLineNo">180</span>   * except using little-endian byte order.<a name="line.180"></a>
<span class="sourceLineNo">181</span>   *<a name="line.181"></a>
<span class="sourceLineNo">182</span>   * @return the next two bytes of the input stream, interpreted as a<a name="line.182"></a>
<span class="sourceLineNo">183</span>   *         {@code short} in little-endian byte order.<a name="line.183"></a>
<span class="sourceLineNo">184</span>   * @throws IOException if an I/O error occurs.<a name="line.184"></a>
<span class="sourceLineNo">185</span>   */<a name="line.185"></a>
<span class="sourceLineNo">186</span>  @Override<a name="line.186"></a>
<span class="sourceLineNo">187</span>  public short readShort() throws IOException {<a name="line.187"></a>
<span class="sourceLineNo">188</span>    return (short) readUnsignedShort();<a name="line.188"></a>
<span class="sourceLineNo">189</span>  }<a name="line.189"></a>
<span class="sourceLineNo">190</span><a name="line.190"></a>
<span class="sourceLineNo">191</span>  /**<a name="line.191"></a>
<span class="sourceLineNo">192</span>   * Reads a char as specified by {@link DataInputStream#readChar()}, except<a name="line.192"></a>
<span class="sourceLineNo">193</span>   * using little-endian byte order.<a name="line.193"></a>
<span class="sourceLineNo">194</span>   *<a name="line.194"></a>
<span class="sourceLineNo">195</span>   * @return the next two bytes of the input stream, interpreted as a <a name="line.195"></a>
<span class="sourceLineNo">196</span>   *         {@code char} in little-endian byte order<a name="line.196"></a>
<span class="sourceLineNo">197</span>   * @throws IOException if an I/O error occurs<a name="line.197"></a>
<span class="sourceLineNo">198</span>   */<a name="line.198"></a>
<span class="sourceLineNo">199</span>  @Override<a name="line.199"></a>
<span class="sourceLineNo">200</span>  public char readChar() throws IOException {<a name="line.200"></a>
<span class="sourceLineNo">201</span>    return (char) readUnsignedShort();<a name="line.201"></a>
<span class="sourceLineNo">202</span>  }<a name="line.202"></a>
<span class="sourceLineNo">203</span><a name="line.203"></a>
<span class="sourceLineNo">204</span>  @Override<a name="line.204"></a>
<span class="sourceLineNo">205</span>  public byte readByte() throws IOException {<a name="line.205"></a>
<span class="sourceLineNo">206</span>    return (byte) readUnsignedByte();<a name="line.206"></a>
<span class="sourceLineNo">207</span>  }<a name="line.207"></a>
<span class="sourceLineNo">208</span><a name="line.208"></a>
<span class="sourceLineNo">209</span>  @Override<a name="line.209"></a>
<span class="sourceLineNo">210</span>  public boolean readBoolean() throws IOException {<a name="line.210"></a>
<span class="sourceLineNo">211</span>    return readUnsignedByte() != 0;<a name="line.211"></a>
<span class="sourceLineNo">212</span>  }<a name="line.212"></a>
<span class="sourceLineNo">213</span><a name="line.213"></a>
<span class="sourceLineNo">214</span>  /**<a name="line.214"></a>
<span class="sourceLineNo">215</span>   * Reads a byte from the input stream checking that the end of file (EOF)<a name="line.215"></a>
<span class="sourceLineNo">216</span>   * has not been encountered.<a name="line.216"></a>
<span class="sourceLineNo">217</span>   *  <a name="line.217"></a>
<span class="sourceLineNo">218</span>   * @return byte read from input<a name="line.218"></a>
<span class="sourceLineNo">219</span>   * @throws IOException if an error is encountered while reading<a name="line.219"></a>
<span class="sourceLineNo">220</span>   * @throws EOFException if the end of file (EOF) is encountered.<a name="line.220"></a>
<span class="sourceLineNo">221</span>   */<a name="line.221"></a>
<span class="sourceLineNo">222</span>  private byte readAndCheckByte() throws IOException, EOFException {<a name="line.222"></a>
<span class="sourceLineNo">223</span>    int b1 = in.read();<a name="line.223"></a>
<span class="sourceLineNo">224</span><a name="line.224"></a>
<span class="sourceLineNo">225</span>    if (-1 == b1) {<a name="line.225"></a>
<span class="sourceLineNo">226</span>      throw new EOFException();<a name="line.226"></a>
<span class="sourceLineNo">227</span>    }<a name="line.227"></a>
<span class="sourceLineNo">228</span><a name="line.228"></a>
<span class="sourceLineNo">229</span>    return (byte) b1;<a name="line.229"></a>
<span class="sourceLineNo">230</span>  }<a name="line.230"></a>
<span class="sourceLineNo">231</span><a name="line.231"></a>
<span class="sourceLineNo">232</span>}<a name="line.232"></a>




























































</pre>
</div>
</body>
</html>
